Starter switch



June 9, 1942. c. CHIRELSTEIN STARTER SWITCH Filed May 15, 1941 M a wm 5mm m Patented June 9, 1942 UNITED STATES PATENT OFFICE sraam swrrcnCharles Chirelstein, Newark, N. .1.

Application May 15, 1941, Serial No. 393,611

1Claim.

bimetallic element of the switch, particularly tov assure a moreextensive and more uniform coating of such element than attainedheretofore.

Further and more or less related objects are to obtain quicker heatingeflects and hence more rapid operation or the switch.

Also, it is an object of the invention to provide a switch of the typementioned, which will be stronger and better in a mechanical sense thanthose heretofore produced.

Further objects will appear and the various novel Ieatures of theinvention are set forth in the following specification and broadlycovered in the claim.

In the accompanying drawing forming part of the specification, a presentembodiment of the invention is illustrated, but it is realized that thestructure may be modified and changed in various ways, all within thetrue intent and scope of the invention as hereinafter defined andclaimed.

Fig. 1 is a side elevation of one embodiment of the invention, theenvelope or container being indicated in broken lines.

Fig. 2 is a showing of the parts as viewed at right angle in respect toFig. 1.

Fig. 3 is a cross-sectional and plan view as on substantially the planeof line 3-4 of Fig. 1.

Fig. 4 is a cross-sectional detail as on line 4-4 of Fig. 2.

In the embodiment of the invention illustrated, the stem 5, whichcarries the bimetallic switch element 6, is bent at an angle at I, 011to one side of the press or stand 8, and the bimetallic strip isattached at its one end at 9, so as to hang in an inverted position,Fig. 2, at the side of the press.

The other stem 10, is bent at its upper end at H, above and toward theupright portion of the first stem and to this angled portion is attachedthe plate or tab l2, carrying at the underside at II, a material such asmagnesium or barium magnesium.

With this location and relation of parts, the magnesium or bariummagnesium is flashed directly down into the bight or loop in thebimetal, which in this cupped or cup forming relation catches and holdsthe flash to an extent suflicient to insure complete and eil'ectivecoating of the entire inner surface of the bimetal. The overstandingplate or tab l2, acts as a cover or shield confining the flash at thetop and directing it I downward, substantially or for the most part,into the confining loop of the bimetal.

Contact between the bimetal and the other element oi. the switch isprovided on expansion of the bimetal by a rod or strip 14, projectinglaterally from the free end of the bimetal into the plane of the uprightportion of stem II.

The envelope or container for the switch parts is indicated in a generalway by broken lines II, in Fig. 1, it being understood that afterevacuation, this envelope is usually filled with a gas or combination ofgases, such as neon, argon, krypton or helium.

In a present method of manufacture, the combination leading in andsupporting conductors i and III, are cut oil substantially even and thefirst bent relatively close to the press to form a short stem with arelatively long arm I, projecting to the rear or away from the press tosupport the bimetal oil to one side of the press and the other bent at apoint further from the end of the stem to form a longer tem, with ashorter arm II, projecting over the end of the press, above and towardthe first stem for supporting the emissive coating carrying plate overthe loop of the bimetal, This plate and the bimetal are readily securedto these angularly projecting arms as by welding. So combined, the partsconstitute a particularly compact arrangement, projecting only a slightdistance beyond the press and therefore constituting a smallunit ofrugged design, well able to stand any shocks to which such a switch maybe subjected. The small size. compact arrangement of the switch elementsenables the use of a particularly small enclosing envelope, reducing theclean-up and exhausting requirements and the amount of gas or gasesnecessary to fill the envelope.

What is claimed is:

A starter switch, comprising an envelope, a support projecting into saidenvelope, conductive stems projecting beyond the end of said supportinto the envelope, one of said stems having an angularly bent endportion projecting laterally to one side of said support, a bowedU-shaped bimetallic switch element having one end attached to saidlaterally projecting end portion of said stem and supported thereby inlaterally spaced relation to one side of said support and with the loopof the same located to the side of the support and inward oi the end ofthe support, the opposite free end of said U-shaped bimetallic plateextending across the gap between the sup- 10 ported and the free,contact ends of said bimetallic switch element and faced directly intothe loop of said U-shaped bimetallic switch element and said facingportion of said plate having an electron emissive coating directedtoward and into said closed loop of said U-shaped bimetallic switchelement.

CHARLES CHIRELSTEIN.

